1. BT-headset has problems. ?
Nope. Upgraded from Quarx' CM10 4.1.2 and wiped Data/Cache before flashing this build. Paired my Sennheiser MM550 again and Bluetooth A2DP (Audio), AVRCP (Remote) and HFP (Calling/Mic) protocols work...
I've just removed it for CM9 back.
"Improved stability of camera (Bayer has problems with sound), DroidSSHD, Trebuchet, common stability fixes. Note: in this build, need reboot for OnScreenButtons, due to some new cyan stuff, will be fixed in next version."